Journal ArticleDOI
Cadmium-tolerant plant growth-promoting bacteria associated with the roots of Indian mustard (Brassica juncea L. Czern.).
Andrey A. Belimov,Nikos Hontzeas,Vera I. Safronova,S. V. Demchinskaya,Giovanna Piluzza,Simonetta Maria Bullitta,Bernard R. Glick +6 more
TLDR
A positive correlation between the in vitro ACC deaminase activity of the bacteria and their stimulating effect on root elongation suggested that utilization of ACC is an important bacterial trait determining root growth promotion.Abstract:
Eleven cadmium-tolerant bacterial strains were isolated from the root zone of Indian mustard (Brassica juncea L. Czern.) seedlings grown in Cd-supplemented soils as well as sewage sludge and mining waste highly contaminated with Cd. The bacteria also showed increased tolerance to other metals including Zn, Cu, Ni and Co. The isolated strains included Variovorax paradoxus, Rhodococcus sp. and Flavobacterium sp., and were capable of stimulating root elongation of B. juncea seedlings either in the presence or absence of toxic Cd concentrations. Some of the strains produced indoles or siderophores, but none possessed C2H2-reduction activity. All the strains, except Flavobacterium sp. strain 5P-3, contained the enzyme 1-aminocyclopropane-1-carboxylate (ACC) deaminase, which hydrolyses ACC (the immediate precursor of plant hormone ethylene) to NH3 and a-ketobutyrate. V. paradoxus utilized ACC as a sole source of N or energy. A positive correlation between the in vitro ACC deaminase activity of the bacteria and their stimulating effect on root elongation suggested that utilization of ACC is an important bacterial trait determining root growth promotion. The isolated bacteria offer promise as inoculants to improve growth of the metal accumulating plant B. juncea in the presence of toxic Cd concentrations and for the development of plantinoculant systems useful for phytoremediation of polluted soils. q 2004 Elsevier Ltd. All rights reserved.read more
Citations
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Journal ArticleDOI
Plant Growth-Promoting Bacteria: Mechanisms and Applications
TL;DR: It is envisioned that in the not too distant future, plant growth-promoting bacteria (PGPB) will begin to replace the use of chemicals in agriculture, horticulture, silviculture, and environmental cleanup strategies.
Journal ArticleDOI
Mechanisms and applications of plant growth promoting rhizobacteria: Current perspective
TL;DR: The latest paradigms of applicability of these beneficial rhizobacteria in different agro-ecosystems have been presented comprehensively under both normal and stress conditions to highlight the recent trends with the aim to develop future insights.
Journal ArticleDOI
Using soil bacteria to facilitate phytoremediation.
TL;DR: An overview of bacterially assisted phytoremediation is provided here for both organic and metallic contaminants, with the intent of providing some insight into how these bacteria aid phytorenmediation so that future field studies might be facilitated.
Journal ArticleDOI
Promotion of plant growth by ACC deaminase-producing soil bacteria
TL;DR: In this article, the physiological basis for plant growth-promotion effect is examined in some detail, and models are presented that endeavour to explain the seemingly paradoxical effects of ethylene on a plant's response to stress, how the expression of this enzyme is transcriptionally regulated in many bacterial strains and how ACC deaminase-containing plant growthpromoting bacteria alter plant gene expression and positively modulate plant growth.
Journal ArticleDOI
Potential of siderophore-producing bacteria for improving heavy metal phytoextraction
TL;DR: The diversity and ecology of metal resistant SPB are highlighted and their potential role in phytoremediation of heavy metals is discussed and an increase in plant growth and metal uptake will further enhance the effectiveness of phytOREmediation processes.
References
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